Engine Cooling System

2. 
Presented By :-
Yajurvendra Singh Tomar
Roll no. -120106287

3. 
 The burning air-fuel mixture in the engine cylinders may
reach high temperature. This means engine parts get hot.
However, cylinder walls must not reach hotter than about
500°F [260°C], higher temperatures causes lubri-cating oil
to break down and lose its lubricating ability. Other
engine parts are also damaged. To prevent over-heating,
the cooling system removes the excess heat. The cooling
system keeps the engine at its most efficient temperature
at all speeds and operating conditions. It also helps bring
the engine up to normal operating temperature as quickly
as possible. In addition, the cooling system provides a
source of heat for the passenger-compartment heater-and-
air- conditioner.
Introduction

4. 
Cooling System uses five
basic parts:-
 Water Jacket
 Water Pump
 Thermostat
 Radiator
 Fan

5.  Water Jacket
The water jackets are open spaces between the
cylinder walls and the outside shell of the block and head.
Coolant from the water pump flows first through the
block water jackets. Then the coolant flows up through
the cylinder-head water jackets and back to the radiator.
 Water Pump
The pump draw coolant from the bottom of the radiator.
They force the coolant through the pump outlet to the
water jackets.
Components of cooling
System

6.  Thermostat
The thermostat is a heat-operated valve that regulates coolant
temperature. It does this by controlling coolant flow from the
engine to the radiator. The thermostat is in the coolant passage
between the cylinder head and the radiator. The valve in the
thermostat opens and closes as coolant temperature changes.
When the engine is cold, the thermostat closes. As the engine
warms up, the thermostat opens. This prevents or allows
coolant to flow through the radiator.

7. 
 Radiator
The radiator is a heat exchanger that removes heat from
engine coolant passing through it. The heat transfers from
the hot coolant to the cooler outside air. An automotive
radiator has three main parts.
 These are a radiator core, and inlet and outlet tanks. The
cores are usually made of aluminium. The tanks may be
made of plastic or metal. The core has two sets of
passages, a set of tubes, and a set of fins attached to the
tubes. The tubes run from the inlet tank to the outlet tank.
Coolant flows through the tubes and air flows between
the fins. The hot coolant sends heat through the tubes to
the fins. The outside air passing between the fins picks up
and carries away the heat. This lowers the temperature of
the coolant. The coolant flows from the upper tank down
through the tubes to the lower tank.

8.  Engine Fan
The radiator sometimes needs additional airflow through
it to prevent the engine from overheating. This usually
occurs at idle and slow speed. At higher vehicle speeds,
the air rammed through the radiator by the forward
motion of the vehicle provides all the cooling that is
needed.

9. 
 Antifreeze
Antifreeze is a chemical additive which lowers the freezing
point of a water-based liquid. An antifreeze mixture is used to
achieve freezing-point depression.
 .Most automotive engines are "water"-cooled to remove waste
heat, although the "water" is actually antifreeze/water mixture
and not plain water. Water pump seal lubricant is also added.

10. 

11.  The cooling system is a system of parts and fluid that work
together to control an engine’s operating temperature for
optimal performance. The system is made up of passages
inside the engine block and heads, a water pump to
circulate the coolant, a thermostat to control the
temperature of the coolant, a radiator to cool the coolant,
and hoses to transfer the coolant from the engine to the
radiator.
 The liquid that flows through a cooling system, antifreeze,
or commonly referred to as coolant, withstands extreme hot
and cold temperatures.
Working

12. 
 Coolant follows a circulation path that begins with
the water pump. The water pump draw coolant from
the radiator and push it into the engine block. Pumps
are usually fan. Nowadays, they may even be driven
electrically. If the water pump experiences a leak
from the seal, it can compromise the entire cooling
system, causing the vehicle to overheat.

13. 
 As coolant flows through the system, it picks up heat
from the engine before arriving at the thermostat. The
thermostat is a valve that measures the temperature of the
coolant and opens to allow hot fluid to travel to the
radiator. If the thermostat becomes stuck and quits
working, it will affect the entire cooling system.
 Once released by the thermostat, hot coolant travels
through a hose to be cooled by the radiator. It passes
through thin tubes in the radiator. It is cooled as air flow
is passed over the outside of the tubes.

14. 
Need
 Cooling system is one of the most important parts of
the automobile; it dissipates the extra heat out of the
engine which can damage the various components of
the engine. The temperature of the engine reaches
high enough to weld the piston with the cylinder
which can damages the engine. So the cooling system
keeps the various components of the engine cool and
safe.